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Index/Topics/Undercount Correction

Undercount Correction

The correction for undercount in estimating unauthorized immigrants, including the methods used by different organizations.

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Feb 3, 2026

How do the Center for Migration Studies, Pew Research Center, and Migration Policy Institute calculate state-level undocumented population estimates and how do their methods differ?

Three leading estimators—the , the , and the —all start from the same problem ( and ACS do not record legal status) and largely rely on the residual estimation family of techniques, but they implement...

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